Calcium silicate insulation is the microcellular structured inorganic rigid, asbestos-free, and super-light heat insulation material mainly composed of inorganic siliceous and calcium and made by special technology such as the hydrothermal reaction under high temperature and high pressure etc. It can maintain the high insulating effect under 650℃ and is advantageous in the stability of coping with temperature changes. With super-low chloride ion content, it can provide very nice protection on pipelines, and it prefabricated to shape up, greatly extending the service life.